Cannot read property 'replaceChild' of undefined at replaceMessage-慕课网

Cannot read property 'replaceChild' of undefined at replaceMessage

来源：9-15 替换元素节点replaceChild()

夏蓓梓

2019-07-13 14:19

<script type="text/javascript">
    function replaceMessage(){
        var oldnode = document.getElementsByTagName("b");
        var oldnodetext = oldnode.innerHTML;
        var newnode = document.createElement('i');
        oldnode.perentNode.replaceChild(newnode,oldnode)
        newnode.innerHTML = oldnodetext;
    }
</script>

哪里写错了呢？为什么报这个错

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5回答

我信你个鬼

2019-09-02 14:18:42

function replaceMessage(){
// 先获取被替换的元素 <b>
var oldnode = document.getElementById("oldnode");
// 创建一个替换元素 <i>
var newnode = document.createElement("i");
// 将新元素替换旧元素 <i>替换<b>
oldnode.parentNode.replaceChild(newnode,oldnode);
// 最后导入文本
newnode.innerHTML = oldnode.innerHTML;
}
replaceMessage();

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weixin_慕运维8217716

2019-08-14 15:00:24

var oldnode = document.getElementsByTagName("b")[0];

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weixin_慕运维8217716

2019-08-14 14:58:57

parentNode

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qq_慕仙5166478

2019-08-12 14:25:27

倒数第五行的i要用两个引号引起来啊“i”

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qq_慕标3547399

2019-07-14 00:30:39

replaceChild替换子节点，你没有创建新的节点，document.createTextNode("i")

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